OpenSea is a decentralized non-fungible token (NFT) market for buying, selling, and exchanging NFTs. In fact, OpenSea manufacturers itself as the most important market for virtual goods. OpenSea based in January 2018. So, you may see how new NFT marketplaces are. Founders Alex Atallah and Devin Finzer determined the environment changed into prepared for an NFT market after seeing CryptoKitties in action.